Let WWW be the span of (1,0,1)(1, 0, 1)(1,0,1) and (0,1,0)(0, 1, 0)(0,1,0). Which vector is the projection of (1,1,1)(1, 1, 1)(1,1,1) onto WWW?
(1,1,1)(1, 1, 1)(1,1,1)
(1,1,0)(1, 1, 0)(1,1,0)
(1,1,1/2)(1, 1, 1/2)(1,1,1/2)
(1/2,1/2,1/2)(1/2, 1/2, 1/2)(1/2,1/2,1/2)